Senses of humor define people, as factions, deeper rooted than religious or political opinions. When carrying out everyday tasks, opinions are rather easy to set aside, but those whom a person shares a sense of humor with are his closest friends. They are always there to make the biggest influence.

All obstructions to the execution of the laws, all combinations and associations, under whatever plausible character, with the real design to direct, control, counteract, or awe the regular deliberation and action of the constituted authorities, are destructive of this fundamental principle, and of fatal tendency. They serve to organize faction, to give it an artificial and extraordinary force; to put, in the place of the delegated will of the nation the will of a party, often a small but artful and enterprising minority of the community; and, according to the alternate triumphs of different parties, to make the public administration the mirror of the ill-concerted and incongruous projects of faction, rather than the organ of consistent and wholesome plans digested by common counsels and modified by mutual interests.

It's only in mediocre books that people are divided into two camps and have nothing to do with each other. In real life everything gets mixed up! Don't you think you'd have to be a hopeless nonentity to play only one role all your life, to have only one place in society, always to stand for the same thing?

This is how we came by our factions: Candor, Erudite, Amity, Abnegation and Dauntless." Max smiles. "In them we find administrators and teachers and counselors and leaders and protectors. In them we find our sense of belonging, our sense of community, our very lives.